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The correct term is subnet mask instead of subnet mass. A subnet mask separates an IP address into the host address and the network address. It is a 32-bit number that can mask an IP address.
255.255.255.0
Any device (mac or not) receives its subnet mask from the DHCP service, or by manually configuring the interface. In the case of manual configuration you would need to check with your network administrator to find out the correct setting for the subnet mask.
It does not require a subnet mask.
If this is a default subnet mask, then it would be a class C subnet mask. If you are subnetting a network and this is not the default subnet mask, then it could be either a class A or class B.
The default subnet mask has a standard size. The custom subnet mask allows you to make subnets that are smaller or larger than the default.
2 given subnets
255.255.255.0
255.255.255.0
IP Address Additional info: The IP address for a client may not be on the correct subnet; it is possible that the subnet mask is incorrect.
Subnet mask for the above is 255.0.0.0
if the ip address is 192.168.2.1 then the subnet mask should be 255.255.255.0